Abstract

This paper presents the results of measurement and calculation within an upgraded Zuber model of critical heat flux (CHF) during nucleate boiling in thin horizontal layers of liquid. The layer height was increased in regimes of developed nucleate boiling. The two-phase layer was foam with vapor columns ascending at the corners of a rectangular square lattice. In the calculations, the foam was considered as an isotropic homogeneous system. The model assumes that the diameter of the vapor columns and the critical Helmholtz instability wavelength are independent of the foam density and are determined by the length of the most dangerous Rayleigh--Taylor instability wavelength. The proposed model fits the CHF experimental data for boiling liquid and can explain the CHF decrease in solutions with addition of surfactants that increase foaming.

中文翻译：

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有限高度水平液体层中核沸腾的危机

摘要

本文介绍了在升级的Zuber模型中，在薄的水平液体层中进行核沸腾时的临界热通量（CHF）的测量和计算结果。在发生核沸腾的过程中，层高增加了。两相层是泡沫，具有在矩形方形格子的拐角处上升的蒸气柱。在计算中，泡沫被认为是各向同性的均质体系。该模型假定蒸气柱的直径和临界亥姆霍兹不稳定性波长与泡沫密度无关，并且由最危险的瑞利-泰勒不稳定性波长的长度确定。所提出的模型符合沸腾液体的CHF实验数据，并且可以解释通过添加增加泡沫的表面活性剂，溶液中CHF的降低。